The stereoselectivity of four hepatic glutathione S -transferases purifed from a marine elasmobranch ( Raja erinacea ) with several K-region polycyclic arene oxide substrates
Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, ISSN: 0167-4838, Vol: 914, Issue: 2, Page: 127-135
1987
- 11Citations
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Metrics Details
- Citations11
- Citation Indexes11
- 11
- CrossRef4
Article Description
Product analysis by HPLC demonstrated that three hepatic cytosolic glutathione S -transferases of little skate (E-2, E-3 and E-4) were highly stereoselective, if not stereospecific, for thiol reaction at the R -configured oxirane carbons of four K-region arene oxides; pyrene 4,5-oxide, (±)-benz[ a ]-anthracene 5,6-oxide, (±)-benzo[ a ]pyrene 4,5-oxide and phenanthrene 9,10-oxide. A fourth transferase, E-5, exhibited no stereopreference with pyrene 4,5-oxide or phenanthrene 9,10-oxide. Immunological and electrophoretic evidence has shown that the three enzymes exhibiting stereospecificity have a common subunit which is absent from enzyme E-5. The high stereoselectivity of the three enzymes E-2, E-3, and E-4 was accompanied by effective catalysis of the reaction of GSH with these K-region epoxides, for example, the calculated turnover number for E-4 with benzo[ a ]pyrene 4,5-oxide was 550.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/0167483887900550; http://dx.doi.org/10.1016/0167-4838(87)90055-0; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0023645276&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/3607067; https://linkinghub.elsevier.com/retrieve/pii/0167483887900550; http://dx.doi.org/10.1016/0167-4838%2887%2990055-0; https://dx.doi.org/10.1016/0167-4838%2887%2990055-0
Elsevier BV
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